Scroll down the Settings page until you see a section related to preferences. You are looking for an option that explicitly says “Sprache / Language”.
The DB Navigator is primarily a mobile app. The desktop website (bahn.com) handles languages differently: db navigator how to change language
However, the app does not sync with the website’s language preferences – they are completely independent. Scroll down the Settings page until you see
Important: There is no language selection dropdown directly in the Tools → Preferences menu. The language must be changed via a configuration file. However, the app does not sync with the